Can You Override Off Peak Hot Water?

Do you live in one of the many, many households whose hot water system heats overnight on an off peak hot water tariff? It’s therefore very possible – especially as you’re reading this – that you want out.

Usually, it’s because the household has grown and the overnight heat just isn’t lasting until everyone’s done in the bath and shower. But perhaps you’ve had a solar system installed and want your system heating during the day so it draws on your own free power instead of overnight grid electricity. Or maybe you’re simply curious about whether you’re locked in – or whether there’s actually a choice here.

As you can probably imagine, we get asked about how to override off peak hot water – or even turn it off completely – all the time. So don’t think of yourself as some kind of plumbing rebel! It’s a perfectly reasonable question to ask.

So let’s give you the good news upfront – there are definitely a few avenues worth exploring before you absolutely need to call a plumber. In order of ‘easiest and free’ to ‘okay, now you actually need a professional’, here’s what to do:

1. Find out what you’re actually working with first

Before overriding anything, you need to know what kind of system is heating your water and how it’s being told when to do it.

Off peak water heater setups generally fall into one of two camps:

• A separate off-peak circuit and tariff, controlled by your electricity retailer via a signal sent to a relay or contactor at your switchboard.
• A timer switch, physically installed and controlled on-site, that turns the system on and off at set times.

The first one is largely out of your hands without a conversation with your retailer. The second one is something you might genuinely be able to adjust yourself. And knowing which one you’ve got changes everything that follows.

What’s the easiest way to find out? Simply look at your switchboard or check your electricity bill for a “controlled load” or “off peak” tariff line item.

2. Check for a hot water system timer switch

If you do have a physical hot water system timer switch – and a lot of homes do, usually mounted at the switchboard or sometimes near the hot water unit itself – this is your best shot at a genuine DIY win.

Timer switches typically have a dial or digital display with pins or settings you can adjust to change when the system is allowed to run. If yours is the old-school dial-with-pins variety, you can often physically move the pins to extend or shift the heating window yourself – no electrician required.

This is genuinely the easiest version of how to change electric hot water heating times – assuming the timer is accessible, labelled clearly, and not something installed inside a locked meter box that technically belongs to your network provider (which, annoyingly, is sometimes exactly the case).

3. Check whether it’s actually a tariff issue, not a timer issue

If there’s no separate physical timer and your system runs on a controlled load tariff instead, the “off” switch isn’t really a switch at all – it’s a signal sent remotely by your electricity distributor to a relay at your property. You can’t override this with a screwdriver and good intentions, no matter how motivated you are.

Knowing how to turn off off peak hot water in this scenario usually means one of two things:

• Switching your hot water circuit off the controlled load tariff entirely (which usually means a higher cost per unit, but heating whenever you like)
• Or living with the existing schedule and working around it.

This is the point where a phone call – either to your electricity retailer or a licensed electrician – becomes the actual next step, rather than another thing to fiddle with at the switchboard.

4. Consider whether you actually want (or need) to override it

Before going any further, it’s worth a quick gut check. Because off peak hot water exists because it’s cheaper – sometimes significantly. If you override it and switch to heating on a standard tariff, your hot water heating costs will very likely increase, sometimes by a meaningful amount depending on your retailer and plan.

If your actual problem is “I run out of hot water by the time I need it in the morning,” that’s sometimes solvable without touching the off-peak schedule at all:

• A tank upgrade
• A boost function
• Adjusting the timer window slightly.

All of these can fix the problem without abandoning the cheaper tariff altogether. So it’s definitely worth asking a plumber about this specific scenario before assuming a full override is the only fix.

5. Get an electrician or plumber involved for anything beyond the timer dial

Have you worked through the above and you’re even more confident than before that you need this changed properly? Well, at the end of the day, it genuinely is electrician or plumber territory.

Things like switchboard work, contactor relays, and anything connected to your electricity network’s controlled load infrastructure isn’t a DIY job. And we mean that attempting it yourself isn’t just risky – in many cases it’s not legal for an unlicensed person to do.

A licensed tradesperson can also tell you, properly, whether overriding off-peak makes financial sense for your situation, which is something no forum post or switchboard sticker is going to do accurately.

So, where does that leave you?

Got a physical hot water system timer switch you can access? Try adjusting it yourself first – which is a totally reasonable thing to do.

Running on a controlled load tariff with no accessible timer? That’s a conversation with your retailer or an electrician, not a DIY project under any circumstances.

And before you override anything, make sure you’re solving the actual problem and not just trading a cheaper tariff for a more expensive one that doesn’t fix what was bothering you in the first place.

When you’re ready to get it sorted properly

Tradie Near Me connects you with licensed local electricians and plumbers who can sort out your hot water timing properly – whether that’s adjusting your system, changing your tariff setup, or just explaining what’s actually going on at your switchboard.

Get an obligation-free quote today.